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延时注入跨库注入

思路：

 1 mysql> show databases;
 2 +--------------------+
 3 | Database           |
 4 +--------------------+
 5 | information_schema |
 6 | challenges         |
 7 | mysql              |
 8 | performance_schema |
 9 | phpmyadmin         |
10 | ro1                |
11 | security           |
12 +--------------------+
13 7 rows in set (0.01 sec)
14 
15 mysql> select * from information_schema;
16 ERROR 1046 (3D000): No database selected
17 mysql> use ro1;#随便用一个数据库
18 Database changed

 1 +--------------+--------------------+----------------------------+------------------------+----------+
 2 | CATALOG_NAME | SCHEMA_NAME        | DEFAULT_CHARACTER_SET_NAME | DEFAULT_COLLATION_NAME | SQL_PATH |
 3 +--------------+--------------------+----------------------------+------------------------+----------+
 4 | def          | information_schema | utf8                       | utf8_general_ci        | NULL     |
 5 | def          | challenges         | gbk                        | gbk_chinese_ci         | NULL     |
 6 | def          | mysql              | latin1                     | latin1_swedish_ci      | NULL     |
 7 | def          | performance_schema | utf8                       | utf8_general_ci        | NULL     |
 8 | def          | phpmyadmin         | utf8                       | utf8_bin               | NULL     |
 9 | def          | ro1                | utf8                       | utf8_general_ci        | NULL     |
10 | def          | security           | gbk                        | gbk_chinese_ci         | NULL     |
11 +--------------+--------------------+----------------------------+------------------------+----------+
12 7 rows in set (0.00 sec)
13 
14 mysql> select schema_name from information_schema.schemata limit 1,1;
15 +-------------+
16 | schema_name |
17 +-------------+
18 | challenges  |
19 +-------------+
20 1 row in set (0.00 sec)

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原文地址：https://www.cnblogs.com/nul1/p/8987604.html